table.sokoban {
  border-collapse: collapse;
}

table.sokoban td {
  width: 32px;
  height: 32px;
  padding: 0;
  vertical-align: middle;
  text-align: center;
}

table.sokoban td.empty {
  background-image: url(../img/sokoban/empty.png);
}
table.sokoban td.wall {
  background-image: url(../img/sokoban/wall.png);
}
table.sokoban td.exit {
  background-image: url(../img/sokoban/exit.png);
}
